Electric arc welding of pipe joints



June 1931- H. J. BURNISH 1,810,902

ELECTRIC ARC 'ELDIY'G OF PIPE JOINTS Filed Nov. 1 1929 s FIG. 1.

.FIG- 4- INVENTQR. Howard .lBumish KKW' ATTORNEY.

Patented June 23, 1931 UNITED, STATES PATENT OFFICE HOWARD J'. IBURNISH, F MILWAUKEE, WISCONSIN, ASSIGNOR TO A. 0. SMITH COR- PORATION, OF MILWAUKEE, WISCONSIN, A CORPORATION OF NEW YORK ELECTRIC ABC WELDING OF PIPE JOINTS Application filed November 18, 1929. Serial No. 407,978.

This invention relates to electric arc welding of pipe joints.

The object of the invention is to provide a welded pipe joint without wasting a pertion of the length of the pipe and which will be free from the'objeotions as to projections on the inside of the pipe.

Another object is to provide a novel scarfing of the end edges of the pipe sections 1 whereby the sections may be interlocked in alignment and whereby a welding groove is provided for receiving deposited welding metal.

Other objects will appear hereinafter with reference to the preferred embodiment illus trated in the accompanying drawings in which the views are as follows:

Figure 1 is a longitudinal section of a pipe section. Fig. 2 is an enlarged section showing two pipe sections in position for welding.

v Fig. 3 is a similar section showing the finished weld.

Fig. 4 is a section similar to Fig. 2 showing a modified form of scarf.

The pipe sections 1 and 2, to be oined, preferably have their ends upset or otherw se formed to provide beads .3 at the outer circumference thereof. Each pipe section has a scarf 4 at the inner circumference of one of its ends and a complementarytongue or projection 5 at the inner circumference of its other end.

As shown in Fig. 2, the complementary ends of the pipe sections 1 and 2 are abutted with the tongue 5 of the section 2 inserted into the scarf 4 of section 1 to align and interlock the pipe sections preparatory for welding.

The end edges are further shaped to provide a welding groove 6 above the interlocking tongue 5 and scarf 4 and between the respective beads 3. In the shaping of the ends of the pipe sections, it has been found preferable to heat the metal at the ends of the sections locally and then to force the same,

ness as to define a welding groove 6 of approximately the same depth as the thickness of the wall of the pipe sections 1 and 2.

However, the beads 3 may be dispensed with entirely as in the modified form of =chamfer illustrated in Fig. 4.

In welding the pipe sections together, metal is deposited in'the welding groove 6 preferably by means of an electric arc until the groove is substantially filled. The weld 7 thus provided has fused welding metal for a depth substantially equal to the thickness of the pipe walls. .The interlocking portion of the pipe ends are also fused together by the arc.

The invention provides a pipe joint which is of maximum strength and which allows utilization of the full length of the pipe sections without waste. Furthermore, the interlocking tongue-and scarf prevent the formation of icicles or projections on the inner wall of the joint.

I claim:

1. A pipe joint comprising two sections of pipe having their meeting ends interlocked, raised beads at the outer circumference of said ends to define a welding groove there-' between, and welding metal deposited between said beads and ends and fused with and joining said interlocked ends to form an integral tubular structure.

2. A pipe joint comprising two sections of pipe to be joined end'to end,.said pipe sections having their meeting ends provided with tongue and groove interlocking ortions and raised beads defining a wel ing groove, and welding metal deposited in the welding groove and fused with the metal of the ends of the pipe sections and said beads to join the same into an integral tubular structure.

3. In electric arc welding, the steps which comprise providing a tongue at the lower edge of one of the parts to be welded, providing a complementary scarf for receiving said tongue in the other edge to be welded, providing a welding groove above the interlocked tongue and scarf of the edges, depositing welding metal in said groove, and fusing the same with the metal of the edges to thereby weld the interlockedi ec'ige portions into an integral structure. 7

4:, A pipe joint comprising a. Pair of pipe sections having their adjacent ends in ehutting relation with e welding groove there- 5 between, a. relatively thin projection extent];-

ing from one of the end; edges to the other and closing the groove at the inner surface of the pipe, raised oircumferentiei heads at said end edges provioiing an achiitionei depth W of the Welding groove, and Weici inetei iiiiing seici groove and uniting said sections into an integral structure.

5. A Welded joint comprising metoi ports having their adjacent edges in ohutting ire iation with e Welding groove therehetween, e reintiveiy thin xogection entenoiing from one of seioi edges to the otheiand closing the Welding groove at the bottom, reisefi circumferential hoods at the top of seici. eflges providing an odditionei depth of the Weiding groove, and 'Weio metei filling sum groove and uniting saidi parts into an integral strum tore In Witness Whei'eoi have hereunto signed my name at Milwaukee, WVisconsin, this 15th oi Not/eniher i929. 

